Nik's Poulan Thread

[Todd Loosli]

Outstanding job, like the way you made it adjustable for different things in the future, what color are you painting the fixture

 

[heimannm]

I have several tanks from different McCulloch SP models in need of some cleaning and this should work very well on those too.

Mark

 

[fossil]

Nice job Mark!

 

[dsell]

Someone mentioned trying an inline check valve on the S25 fuel line. Did I imagine it? If not, did it work and what is the part number?

 

[fossil]

Someone mentioned trying an inline check valve on the S25 fuel line. Did I imagine it? If not, did it work and what is the part number?

I looked up out some check valves. They are all pretty large and I didn't find anything that looked suitable. They would be really good on a micro. I thought I had come across some fuel filters with check valves but couldn't find any new ones that did.
https://www.banggood.com/Aluminium-...ZEAYYAiABEgKKSvD_BwE&ID=3634&cur_warehouse=CN

Even the 6mm (0.23") would be a tight fit on a 1/8 ID fuel line. A 5mm one would be good.

 

[dsell]

I wonder if the Homelite 69451 check valve would flow enough fuel? A brass compression insert is the perfect diameter and thin walled, that would fit the check valve. I might have to try this when I get some time. The Shindaiwa B45 brush cutter and several others have a check valve built in the fuel line. A356000080

 

[fossil]

Let us know how it goes if you do.

 

[hotshot]

The Shindaiwa B45 brush cutter and several others have a check valve built in the fuel line. A356000080

Good tip right there, ordered one to see what the OD size is.

It just stuffs up into the fuel line like a tampon, before you put the fuel filter into it.

 

[s sidewall]

Ball check valve or rubber flapper type?

Steve

 

[dsell]

Flapper.

 

[3000 FPS]

Check into fuel filters that might have a check valve built into them.

 

[Todd Loosli]

I need some help and information, is there any real difference in performance between the 3700 and the 3800. The 3700 with its 2 thin rings and the 3800 with 2 fat rings and all else the same ,also what about long-term lasting

 

[fossil]

The 3700's generally have higher compression. I checked two of my 3700's and both were at 170 psi. A pretty fresh 3800 I have is at 138 or so.

The bare cylinders seem to last a long time. Many 3400's still going strong. I think the the highest comp # I've seen on one of my 3400's is just under 130psi
Definitely no longevity numbers on the 3800's. I would bet the 3700 rings wear faster as those thin steel rings don't last as long as cast iron thick rings.

I've never run them side by side but I don't think there's much difference in power.

 

[2stroke_shaman]

It is clearly something I did on the notebook, my phone and my work computer are fine. Hopefully I can get to the bottom of it later this week when I am home again. For now, here are some photos of the device. I had some foam packing material left over from the new notebook so I used that to cushion the tank in the arms of the device.

View attachment 635901

View attachment 635902

View attachment 635903

I still need to change the motor to a 3 phase so I can use an inverter and slow it down. For this job I put a longer screw in the end of the motor shaft (holds the sheave on the motor) and chucked it in my drill so I could run it slow enough to let the nuts tumble. The tank is now in the basement next to the wood stove to allow the Red Kote to cure.

Mark

There are drives single phase that will slow down/speed up . I have many conveyors at work . We adjust for output .

 

[heimannm]

I couldn't find any affordable single phase drives. I already have the inverter, 220 volt 1 ph supply with 3 ph output, just need a 1 HP motor for the lathe and 2 HP motor for the mill drill.

Mark

 

[Todd Loosli]

I have checked both cylinders every way that I can think of and every dimension is the same, the thin rings must be what makes the difference in compression

 

[2stroke_shaman]

I couldn't find any affordable single phase drives. I already have the inverter, 220 volt 1 ph supply with 3 ph output, just need a 1 HP motor for the lathe and 2 HP motor for the mill drill.

Mark

I agree your 2/3 there . If you have the drive you can use it for both needs .

 

[hotshot]

I have checked both cylinders every way that I can think of and every dimension is the same, the thin rings must be what makes the difference in compression

Bores are different IDs between the 3700 & 3800.

If you don’t believe it, just slip that bare 3700 piston (no rings) into a bare 3800 bore & it rattles around with way too much skirt clearance.

1.880 vs 1.875, so the 3800 bore is 005” bigger.

 

[Todd Loosli]

I guess I should have stated that but I thought, assume, everyone knew that, also the space between the transfer ports is wider on the 3800. I was trying to figure out why the compression was greater in the 3700. Was just saying that the dimensions from the base to ports and ports to top were the same , also the combustion chamber was same. Thanks for saying that the bore was bigger on the 3800, don't want anyone to screw up a p,c cuz they thought it was the same

 

[Acornhill]

I guess I should have stated that but I thought, assume, everyone knew that, also the space between the transfer ports is wider on the 3800. I was trying to figure out why the compression was greater in the 3700. Was just saying that the dimensions from the base to ports and ports to top were the same , also the combustion chamber was same. Thanks for saying that the bore was bigger on the 3800, don't want anyone to screw up a p,c cuz they thought it was the same

I think a lot of the parts houses/ IPL’s call for the same cylinder for both as a direct replacement, could just be a supply issue, cylinder must use certain # piston kit etc


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